This week, a new video was added called “Scouting Soybean Aphids” which breifly demonstrates scouting and discusses management in Wisconsin fields.

[youtube]http://www.youtube.com/watch?v=gZTzbroDnws[/youtube]

Economic threshold is reached when a field average is 250 aphids/plant and populations are actively increasing. To calculate a field average, count the number of aphids on each of 20-30 plants/field, from a sample representative of at least 80% of the field.

Begin field scouting in late June (late vegetative to beginning bloom soybean growth stages), making one or two visits/field/week. Continue scouting until aphid populations decline, usually mid to late August.